Walls went up today.
Clamped a strip of wood to a floor joist. Lifted the west wall into place, levelled it, and clamped it to the strip. Screwed the wall into the floor frame.
Lifted the north wall into place. Secured it to the west wall and floor. Removed strip and clamps from the west wall.
Repeat for the south wall.
Managed not to fall down the banking hauling the east wall into place. Attached it to the other walls and floor.
Roof next, if I can find the materials.